Graph description: Figure 2. Histogram of heights of women with venous ulcers, with corresponding Normal distribution curve

A histogram of height in 202 women with venous leg ulcers.

The horizontal axis is labeled Height (cm) and numbered 130, 140, 150, 160, 170, 180, 190. The vertical axis is labeled Relative frequency density and numbered 0.00, 0.02, 0.04, 0.06.

There are vertical bars of width five centimetres starting at 140 and finishing at 185.

The distribution is symmetrical, with the bar at 160 to 165 being the tallest at about 0.062.

A smooth curve is drawn over the bars, going close to the middle of the tops of most of them. It can be seen just above the axis at height = 135 centimetres and starts to rise at 140, rising more steeply until about 154 centimetres, where the relative frequency density is about 0.028. It continues to rise less steeply until it curves over at about 162 centimetres, relative frequency density = about 0.055, to begin to descend. The descending curve is the exact oposite of the rising curve, falling more steeply until height = 170 centimetres then less and less steeply until it is just above the axis at 183 centimetres. It finally disappears at 190 centimetres.

Back to Clinical Biostatistics: Estimation.

This page maintained by Martin Bland.
Last updated: 16 July, 2006.